Reapply "[LV] Mark checks as never succeeding for high cost cutoff." Reapply 8a115b6934a90441 with an update to tests handling remarks. The patch now directly emits a clear remark when we bail out due to the memory check threshold. Original message: When GeneratedRTChecks::create bails out due to exceeding the cost threshold, no runtime checks are generated and we must not proceed assuming checks have been generated. Mark the checks as never succeeding, to make sure we don't try to vectorize assuming the runtime checks hold. This fixes a case where we previously incorrectly vectorized assuming runtime checks had been generated when forcing vectorization via metadate. Fixes the mis-compile mentioned in https://github.com/llvm/llvm-project/pull/166247#issuecomment-3631471588
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